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Appl. Phys. Lett. 95, 231906 (2009); http://dx.doi.org/10.1063/1.3272107 (3 pages)

First-principles studies of the effect of oxygen vacancies on the electronic structure and linear optical response of multiferroic BiFeO3

Sheng Ju1 and Tian-Yi Cai1,2

1Department of Physics and Jiangsu, Key Laboratory of Thin Films, Soochow University, Suzhou 215006, People’s Republic of China
2Department of Physics, The University of Texas, Austin, Texas 78712, USA

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(Received 21 July 2009; accepted 17 November 2009; published online 8 December 2009)

Oxygen vacancies (OVs) have a significant influence on the carrier mobility and optical conductivity in transition metal oxides. In this letter, using density-functional theory, we investigate the effect of OVs on the optical response in multiferroic BiFeO3. Within the generalized gradient approximation plus the on-site Coulomb repulsion, we show that the absorption edge shifts to lower energy with the increase of OV concentration, while the location of the main absorption peak does not change. The agreement between theoretical calculations and experimental measurements of the dielectric function is greatly improved when OVs are considered.

© 2009 American Institute of Physics

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KEYWORDS and PACS

PACS

  • 77.22.Ch

    Permittivity (dielectric function)

  • 78.20.Ci

    Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

  • 61.72.jd

    Vacancies

  • 71.15.Mb

    Density functional theory, local density approximation, gradient and other corrections

  • 71.20.Ps

    Other inorganic compounds

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PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

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